Systems and methods for improving the performance of a quantum processor to reduce intrinsic/control errors

Abstract

Techniques for improving the performance of a quantum processor are described. Some techniques employ reducing intrinsic / control errors by using quantum processor-wide problems specifically crafted to reveal errors so that corrections may be applied. Corrections may be applied to physical qubits, logical qubits, and couplers so that problems may be solved using quantum processors with greater accuracy.

Description

BACKGROUND[0001]Field[0002]This disclosure generally relates to computationally solving problems.[0003]Solvers[0004]A solver is a mathematical-based set of instructions executed via hardware that is designed to solve mathematical problems. Some solvers are general purpose solvers, designed to solve a wide type or class of problems. Other solvers are designed to solve specific types or classes of problems. A non-limiting exemplary set of types or classes of problems includes: linear and non-linear equations, systems of linear equations, non-linear systems, systems of polynomial equations, linear and non-linear optimization problems, systems of ordinary differential equations, satisfiability problems, logic problems, constraint satisfaction problems, shortest path or traveling salesperson problems, minimum spanning tree problems, and search problems.[0005]There are numerous solvers available, most of which are designed to execute on classical computing hardware, that is computing hard...

AI Technical Summary

Benefits of technology

The patent describes a computational system that includes a quantum processor with multiple qubits and a coupler for controllable communication between the qubits. The system also includes a processor-based device and a non-transitory storage medium. The processor-based device calibrates the coupler and the local bias terms of the qubits using samples obtained from the quantum processor. The calibration process involves iteratively adjusting the coupling terms and the local bias terms until certain criteria are met. The technical effect of the patent is to improve the accuracy and efficiency of the quantum processor by calibrating the coupling terms and local bias terms of the qubits.

Problems solved by technology

However, the final low-energy state may not be the global energy minimum.

These hardware elements are subject to practical constraints, both in design and fabrication that ultimately limit the amount of control that the user can exert on the Ising spin glass parameters hi and Jij.

In contrast, deviations in mutual inductances and flux offsets lead to absolute errors.

Images